I'm afraid the computer is too old to run the game at 60FPS. But thanks for reporting in.
Could you add a setting to lower the graphics to the minimum? (disabling the background of the map so that only the platform can be seen, disabling particles, etc;), not everyone has a good quality pc, it is just a suggestion
There are almost no particles and the background is a simple plane... disabling that will not bump the framerate from 7 to 60. ^^;
and map details? (Like as grass, rocks, etc;)